Find the 40th and the sum of the first 30 terms of the sequence: 2x,4x,6x...

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm

50-60=10

step-by-step explanation:

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step-by-step explanation: